:root {
  --orange: #f7931a;
  --orange-glow: rgba(247, 147, 26, 0.3);
  --dark: #0a0a0a;
  --darker: #050505;
  --gray: #888;
  --light: #e5e5e5;
  --code-bg: #141414;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--darker);
  color: var(--light);
  line-height: 1.6;
  min-height: 100vh;
}

.grain {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Nav */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(5, 5, 5, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #1a1a1a;
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--light);
  text-decoration: none;
}

.nav-logo .claw {
  color: var(--orange);
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--gray);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--light);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 0;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--orange-glow) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0.4;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--code-bg);
  border: 1px solid #222;
  padding: 8px 16px;
  border-radius: 100px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--gray);
  margin-bottom: 32px;
  width: fit-content;
}

.badge span {
  color: var(--orange);
}

h1 {
  font-size: clamp(48px, 10vw, 80px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 24px;
}

h1 .claw {
  color: var(--orange);
}

.tagline {
  font-size: clamp(20px, 3.5vw, 28px);
  color: var(--gray);
  max-width: 600px;
  margin-bottom: 48px;
}

.tagline strong {
  color: var(--light);
  font-weight: 600;
}

.cta-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--orange);
  color: var(--dark);
}

.btn-primary:hover {
  background: #ffa033;
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--code-bg);
  color: var(--light);
  border: 1px solid #333;
}

.btn-secondary:hover {
  border-color: var(--orange);
}

/* Terminal inline block */
.terminal-inline {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--code-bg);
  border: 1px solid #333;
  border-radius: 8px;
  padding: 14px 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 15px;
  cursor: pointer;
  transition: border-color 0.2s;
}

.terminal-inline:hover {
  border-color: var(--orange);
}

.terminal-prompt {
  color: var(--orange);
  user-select: none;
}

.terminal-cmd {
  color: var(--light);
}

.copy-btn {
  background: none;
  border: none;
  color: var(--gray);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  transition: color 0.2s;
}

.copy-btn:hover {
  color: var(--orange);
}

.copy-btn.copied {
  color: #4ade80;
}

/* Sections */
section {
  padding: 120px 0;
  border-top: 1px solid #1a1a1a;
}

h2 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.section-lead {
  font-size: 18px;
  color: var(--gray);
  max-width: 600px;
  margin-bottom: 64px;
}

/* Page header (for subpages) */
.page-header {
  padding-top: 120px;
  padding-bottom: 0;
}

/* Problem cards */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.problem-card {
  background: var(--code-bg);
  border: 1px solid #222;
  border-radius: 12px;
  padding: 32px;
}

.problem-card.bad {
  border-color: #3a1a1a;
}

.problem-card.good {
  border-color: #1a2a1a;
}

.problem-card h3 {
  font-size: 20px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.problem-card p {
  color: var(--gray);
  font-size: 15px;
}

.icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.icon.red { background: #3a1a1a; }
.icon.green { background: #1a3a1a; }

/* How it works flow */
.flow {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.flow-step {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 24px;
  padding: 32px 0;
  border-bottom: 1px solid #1a1a1a;
}

.flow-step:last-child {
  border-bottom: none;
}

.step-num {
  width: 48px;
  height: 48px;
  background: var(--code-bg);
  border: 1px solid #333;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  color: var(--orange);
}

.flow-step h3 {
  font-size: 20px;
  margin-bottom: 8px;
}

.flow-step p {
  color: var(--gray);
}

/* Code block */
.code-section {
  background: var(--code-bg);
  border: 1px solid #222;
  border-radius: 12px;
  overflow: hidden;
  margin-top: 48px;
}

.code-header {
  background: #1a1a1a;
  padding: 12px 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--gray);
  display: flex;
  align-items: center;
  gap: 12px;
}

.code-dots {
  display: flex;
  gap: 6px;
}

.code-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #333;
}

.code-body {
  padding: 24px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  line-height: 1.8;
  overflow-x: auto;
  white-space: pre;
}

.code-body .comment { color: #666; }
.code-body .cmd { color: var(--orange); }
.code-body .flag { color: #888; }
.code-body .value { color: #7ec699; }

/* Security & Auth */
.auth-intro {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 64px;
}

.auth-intro h2 {
  margin-bottom: 24px;
}

.auth-pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 64px;
}

.pillar {
  background: var(--code-bg);
  border: 1px solid #222;
  border-radius: 12px;
  padding: 32px;
}

.pillar h3 {
  font-size: 18px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pillar h3 span {
  font-size: 22px;
}

.pillar .pillar-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--orange);
  margin-bottom: 12px;
}

.pillar p {
  color: var(--gray);
  font-size: 15px;
}

.auth-methods-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--gray);
  text-align: center;
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.auth-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
}

.auth-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--code-bg);
  border: 1px solid #333;
  padding: 10px 20px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  color: var(--light);
  transition: border-color 0.2s;
}

.auth-chip.live {
  border-color: var(--orange);
}

.auth-chip.soon {
  opacity: 0.45;
}

.auth-chip .chip-icon {
  font-size: 18px;
  line-height: 1;
}

.auth-chip .chip-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  background: #1a2a1a;
  color: #4ade80;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 4px;
}

.auth-chip.soon .chip-badge {
  background: #1a1a2a;
  color: #888;
}

.auth-vision {
  text-align: center;
  margin-top: 32px;
  font-size: 15px;
  color: var(--gray);
}

.auth-vision strong {
  color: var(--light);
}

/* Payment Links */
.payment-grid {
  display: flex;
  justify-content: center;
  margin-top: 48px;
}

.payment-preview {
  background: var(--code-bg);
  border: 1px solid #222;
  border-radius: 16px;
  overflow: hidden;
  width: 100%;
}

.payment-preview-header {
  background: #1a1a1a;
  padding: 12px 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--gray);
  display: flex;
  align-items: center;
  gap: 12px;
}

.payment-preview-url {
  background: #0f0f0f;
  padding: 4px 12px;
  border-radius: 6px;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.pay-mockup {
  background: #f5f5f5;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.pay-card {
  background: #fff;
  border-radius: 16px;
  padding: 32px 28px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04), 0 4px 24px rgba(0,0,0,0.06);
  width: 100%;
  max-width: 370px;
  color: #111;
}

.pay-brand {
  display: flex;
  justify-content: space-between;
  margin-bottom: 32px;
}

.pay-brand-name {
  font-size: 15px;
  font-weight: 700;
  color: #111;
}

.pay-brand-sub {
  font-size: 12px;
  color: #aaa;
  margin-top: 2px;
}

.pay-brand-sub em {
  font-style: normal;
  color: #666;
}

.pay-amount {
  text-align: center;
  margin-bottom: 28px;
}

.pay-amount-value {
  font-size: 56px;
  font-weight: 700;
  color: #111;
  letter-spacing: -3px;
  line-height: 1;
}

.pay-amount-cur {
  font-size: 24px;
  font-weight: 600;
  color: #aaa;
  vertical-align: super;
  margin-left: 4px;
}

.pay-amount-meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  font-size: 13px;
  color: #666;
}

.pay-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  display: inline-block;
}

.pay-meta-sep { color: #e8e8e8; }

.pay-recipient {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: #fafafa;
  border: 1px solid #e8e8e8;
  border-radius: 8px;
  margin-bottom: 24px;
}

.pay-recipient-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.pay-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #111;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.pay-recipient-label {
  font-size: 11px;
  color: #aaa;
}

.pay-recipient-addr {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: #666;
}

.pay-btn-mock {
  width: 100%;
  padding: 14px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: #111;
  border: none;
  border-radius: 12px;
  text-align: center;
}

.pay-footer-mock {
  text-align: center;
  padding: 20px 0 4px;
  font-size: 12px;
  color: #666;
}

.pay-footer-mock strong {
  color: #111;
  font-weight: 600;
}

.payment-label {
  padding: 16px 20px;
  font-size: 14px;
  color: var(--gray);
  border-top: 1px solid #222;
}

.payment-label strong {
  color: var(--light);
}

/* Use Cases */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.usecase-card {
  background: var(--code-bg);
  border: 1px solid #222;
  border-radius: 12px;
  padding: 32px;
}

.usecase-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.usecase-card h3 span {
  font-size: 24px;
}

.usecase-card p {
  color: var(--gray);
  font-size: 15px;
}

.usecase-card .example {
  margin-top: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: #666;
  font-style: italic;
}

/* Why Bitcoin / Verify grid */
.verify-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.verify-item {
  padding: 24px;
  background: var(--code-bg);
  border-radius: 12px;
  border: 1px solid #222;
}

.verify-item h4 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  color: var(--orange);
  margin-bottom: 12px;
}

.verify-item p {
  color: var(--gray);
  font-size: 15px;
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 48px;
}

.faq-item {
  background: var(--code-bg);
  border: 1px solid #222;
  border-radius: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 24px 32px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: '+';
  font-family: 'JetBrains Mono', monospace;
  font-size: 20px;
  color: var(--orange);
  transition: transform 0.2s;
}

.faq-item[open] summary::after {
  content: '\2212';
}

.faq-item .faq-answer {
  padding: 0 32px 24px;
  color: var(--gray);
  font-size: 15px;
  line-height: 1.7;
}

.faq-item .faq-answer code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  background: #1a1a1a;
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--orange);
}

/* Roadmap */
.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.roadmap-card {
  background: var(--code-bg);
  border: 1px solid #222;
  border-radius: 12px;
  padding: 32px;
}

.roadmap-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.roadmap-card p {
  color: var(--gray);
  font-size: 15px;
}

.roadmap-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 12px;
  display: inline-block;
}

.roadmap-tag.shipped {
  background: #2a1a1a;
  color: var(--orange);
}

.roadmap-tag.now {
  background: #1a2a1a;
  color: #4ade80;
}

.roadmap-tag.next {
  background: #2a2a1a;
  color: #facc15;
}

.roadmap-tag.later {
  background: #1a1a2a;
  color: #60a5fa;
}

/* Manifesto */
.manifesto {
  background: linear-gradient(135deg, #0f0f0f 0%, #141414 100%);
  border: 1px solid #222;
  border-radius: 16px;
  padding: 48px;
  margin-top: 48px;
}

.manifesto blockquote {
  font-size: clamp(18px, 3vw, 24px);
  font-style: italic;
  color: var(--light);
  border-left: 3px solid var(--orange);
  padding-left: 24px;
  margin: 0;
}

/* Footer */
footer {
  padding: 48px 0;
  border-top: 1px solid #1a1a1a;
  text-align: center;
}

footer p {
  color: var(--gray);
  font-size: 14px;
}

footer a {
  color: var(--orange);
  text-decoration: none;
}

/* Responsive */
@media (max-width: 600px) {
  .hero {
    padding: 60px 0;
    min-height: auto;
  }

  section {
    padding: 80px 0;
  }

  .flow-step {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .manifesto {
    padding: 32px 24px;
  }

  .auth-pillars {
    grid-template-columns: 1fr;
  }

  .nav-links {
    gap: 20px;
  }
}